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| | ThinkPad laptops include a proprietary interface called SMAPI BIOS (System Management Application Program Interface) which provides some | | ThinkPad laptops include a proprietary interface called SMAPI BIOS (System Management Application Program Interface) which provides some |
| − | hardware control functionality that is not exposed by any other interface (e.g., ACPI). | + | hardware control functionality that is not exposed by standard interfaces such as ACPI and APM. |
| − | | |
| − | The SMAPI interfaces changes a lot between models, and is poorly documented, so Linux support is not exhaustive for most models. There are currently two SMAPI access mechanisms available: <tt>thinkpad</tt> and <tt>tpctl</tt> for older ThinkPads, and <tt>tp_smapi</tt> for newer ones.
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| − | {{WARN|These drivers use undocumented features and direct hardware access. They thus cannot be guaranteed to work, and may cause arbitrary damage
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| − | (especially on models they weren't tested on).}}
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| − | ==Using the <tt>tp_smapi</tt> module==
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| − | The <tt>tp_smapi</tt> kernel module exposes some features of the SMAPI BIOS found on recent ThinkPads via a sysfs interface. Currently, the implemented functionality is control of battery charging (this is useful for [[Maintenance#Battery_Treatment|increasing battery lifetime]] or for using a leftover under-spec power supply that can't handle the combined power draw of running and charging), and control of CD/DVD speed.
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| − | * Project page: http://tpctl.sourceforge.net/
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| − | * You need to donwnload only the [http://sourceforge.net/project/showfiles.php?group_id=1212&package_id=171579 tp_smapi kernel module].
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| − | To compile and load the module:
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| − | # tar xzvf tp_smapi-0.08.tgz
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| − | # cd tp_smapi-0.08
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| − | # make load
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| − | To install permanently (optional):
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| − | # make install
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| − | # modprobe tp_smapi
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| − | To set the thresholds for starting and stopping battery charging (in percent of current full charge capacity):
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| − | # echo 40 > /sys/devices/platform/smapi/start_charge_thresh
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| − | # echo 70 > /sys/devices/platform/smapi/stop_charge_thresh
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| − | # cat /sys/devices/platform/smapi/*_charge_thresh
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| − | 40
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| − | 70
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| − | To unconditionally inhibit charging for 17 minutes:
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| − | # echo 17 > /sys/devices/platform/smapi/inhibit_charge_minutes
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| − | To cancel charge inhibiting:
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| − | # echo 0 > /sys/devices/platform/smapi/inhibit_charge_minutes
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| − | To control the speed of the optical drive:
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| − | {{WARN|Changing the CD speed simultaneously with a read or write to the CD will '''hang your computer'''. The <tt>hdparm -E</tt> or <tt>eject -x</tt> commands might also work for you, and are safer (but have no effect on some models, such as ThinkPad 43).<br />''Kernel hackers: if you know how to obtain locks that temporarily prevents the <tt>ide</tt> and <tt>ata_piix</tt>+<tt>libata</tt> drivers from touching the drive, or at least how to check whether an ATAPI device is being accessed, please [[Talk:SMAPI support for Linux|tell the author]].''}}
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| − | # echo 0 > /sys/devices/platform/smapi/cdrom_speed # slow
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| − | # echo 1 > /sys/devices/platform/smapi/cdrom_speed # medium
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| − | # echo 2 > /sys/devices/platform/smapi/cdrom_speed # fast
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| − | # cat /sys/devices/platform/smapi/cdrom_speed
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| − | 2
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| − | Other things that can be controlled through SMAPI, but are not supported in this version of the driver, include forcing battery discharge, PCI bus power saving, CPU power saving control, extended smart battery information and fan control. See the included README file for more information.
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| − | | |
| − | ====Model-specific status====
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| − | * ThinkPad {{T43}}, {{T43p}}, {{R52}}
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| − | ** all works
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| − | * ThinkPad {{X41}}
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| − | ** work: all battery-related
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| − | ** unknown: cdrom_speed
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| − | * ThinkPad {{G41}}
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| − | ** work: start_charge_thresh, inhbit_charge_minutes, cdrom_speed
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| − | ** don't work: stop_charge_thresh (not supported by hardware)
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| − | * ThinkPad {{T42p}}, {{T41}}, {{R51}}, {{X40}}
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| − | ** work: start_charge_thresh, inhbit_charge_minutes
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| − | ** don't work: stop_charge_thresh (not supported by hardware)
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| − | ** unknown: cdrom_speed
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| − | * ThinkPad {{T42}}
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| − | ** work: start_charge_thresh, cdrom_speed
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| − | ** unknown: inhbit_charge_minutes, stop_charge_thresh
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| − | * ThinkPad {{T41p}}, {{T40}}, {{T40p}}, {{R50p}}, {{R40}}
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| − | ** work: cdrom_speed
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| − | ** don't work: all battery-related (not supported by hardware)
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| − | * ThinkPad {{X32}}, {{X31}}
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| − | ** don't work: all battery-related (not supported by hardware)
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| − | ** unknown: cdrom_speed
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| − | Please update the above and report your experience on the [[Talk:SMAPI support for Linux|discussion]] page. If the module loads but gives a "<tt>not supported</tt>" or "<tt>not implementeded</tt>" when you try to use some specific file in {{path|/sys/devices/platform/smapi/}}, please report the <tt>dmesg</tt> output and whether the corresponding functionality is available under Windows - maybe your ThinkPad just can't do that.
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| − | ==Using the <tt>thinkpad</tt> module==
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| − | This solution consists of a module, called <tt>thinkpad</tt>, and a user-space tool caled <tt>tpctl</tt>. It provides very rich functionality for older ThinkPads, but on newer ThinkPads much of this functionality is exposed and supported through an ACPI interface and the SMAPI access does not work anymore. For Linux kernel 2.6.3 and newer you need <tt>tpctl</tt> >=4.14 and <tt>thinkpad </tt> >=5.5. For details, see the [http://tpctl.sourceforge.net/README README] and [http://tpctl.sourceforge.net/SUPPORTED-MODELS list of supported models].
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| − | * Project page: http://tpctl.sourceforge.net/
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| − | * You need to download the [http://sourceforge.net/project/showfiles.php?group_id=1212&package_id=29354t thinkpad module] and [http://sourceforge.net/project/showfiles.php?group_id=1212&package_id=1204 tpctl userspace tool].
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| − | * There is also an optional GUI: [http://sourceforge.net/project/showfiles.php?group_id=1212&package_id=99929 configure-thinkpad].
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| | + | The SMAPI interfaces has mutated between models and is poorly documented, so Linux support is not exhaustive for most models. There are currently two SMAPI access mechanisms available: |
| | + | *[[tp_smapi]] for newer ThinkPad models. This module provides battery information for models produced since 2001 and possibly earlier, and additional features for models produced since 2003. |
| | + | *[[tpctl]] with the <tt>thinkpad</tt> kernel modules worked on older ThinkPad models but are now obsolete: the drivers no longer build (with the latest Linux versions). On modern ThinkPads tpctl has been superseded by the standardized ACPI subsystem and the tp_smapi driver. |
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| | [[Category:Tools]] [[Category:Patches]] | | [[Category:Tools]] [[Category:Patches]] |
